Income Tax Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Balance, beginning of year	$ 109,712us-gaap_UnrecognizedTaxBenefits	$ 102,305us-gaap_UnrecognizedTaxBenefits	$ 81,682us-gaap_UnrecognizedTaxBenefits
Increases to tax positions related to the current year	28,416	21,899	20,453
Increases to tax positions related to prior years	4,469	5,064	4,837
Decreases to tax positions related to prior years		(3,732)	(304)
Reductions due to lapsed statute of limitations	(23,709)	(4,134)	(5,061)
Settlements during current year		(8,957)	(607)
Interest and penalties	(8,327)	(2,733)	1,305
Balance, end of year	$ 110,561us-gaap_UnrecognizedTaxBenefits	$ 109,712us-gaap_UnrecognizedTaxBenefits	$ 102,305us-gaap_UnrecognizedTaxBenefits

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Unrecognized Tax Benefits Income Tax Penalties And Interest Expense Benefit

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No definition available.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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- Definition

Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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